NOTE. 129 



The question of whence the debris has been derived is one open to much doubti 

 As shown at page 36, there is some reason to connect these rocks with the degradation 

 of the crystalline series. It is, however, not impossible that, though sedimentary, they 

 may still be of volcanic origin, although the absence of any undoubtedly igneous rocks 

 among the lower Vindhyans does not favor this view. The brecciated varieties of the 

 trappoids do, however, bear considerable resemblance to such deposits, and it seems that 

 they and the porceUanics must be referred to one origin. If volcanic, the regularity 

 of the bedding and of the minute lamination of the porceUanics, and the very 

 gradual passage from the latter into ordinary shale and sandstone, would indicate for 

 these beds a subaqueous deposition. 



The limestone No. 1, which had previously been mapped from Jaradag to the foot 

 of Mungeysar Hill, has been traced from the latter point up the bed of the Ghagur 

 stream. From this westwards it is concealed by alluvium as far as the Sone north of 

 Agoree-Klas. Beyond this, although much obscured, its outcrop is easily traceable near 

 the right bank of the river, in the streams which cut deeply into the alluvium and in low 

 hills rising above it. The outcrop re-crosses the Sone east of Hurma, at which 

 village the limestone is seen, as mentioned at page 38. 



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